All inlet and discharge fittings below the waterline shall have __________. (small passenger vessel regulations)

Correct Answer: Option A — an efficient and accessible means of closing

46 CFR 119.330 requires that all inlet and discharge fittings located below the waterline be equipped with an efficient and accessible means of closing, such as a sea valve or seacock. This prevents progressive flooding in the event of a piping failure or hose rupture within the vessel.